/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.linkis.engineconnplugin.flink.client.result;

import java.util.Objects;

public class TypedResult<P> {

  private ResultType type;

  private P payload;

  private TypedResult(ResultType type, P payload) {
    this.type = type;
    this.payload = payload;
  }

  public ResultType getType() {
    return type;
  }

  public P getPayload() {
    return payload;
  }

  @Override
  public String toString() {
    return "TypedResult<" + type + ">";
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }
    TypedResult<?> that = (TypedResult<?>) o;
    return type == that.type && Objects.equals(payload, that.payload);
  }

  @Override
  public int hashCode() {
    return Objects.hash(type, payload);
  }

  // --------------------------------------------------------------------------------------------

  public static <T> TypedResult<T> empty() {
    return new TypedResult<>(ResultType.EMPTY, null);
  }

  public static <T> TypedResult<T> payload(T payload) {
    return new TypedResult<>(ResultType.PAYLOAD, payload);
  }

  public static <T> TypedResult<T> endOfStream() {
    return new TypedResult<>(ResultType.EOS, null);
  }

  // --------------------------------------------------------------------------------------------

  /** Result types. */
  public enum ResultType {
    PAYLOAD,
    EMPTY,
    EOS
  }
}
